2019-20 Season Speakers :
2nd Jul : Professor David Rees: “Noctilucent Clouds - A Rare Atmospheric Phenomenon”
|Note: This is an online ZOOM meeting. Access to the meeting will be emailed to members.|
June and July are open season for spotting one of the rarest and most unpredictable of sky sights: clouds that glow in the dark. They are called noctilucent clouds, which is Latin for “night-shining".
Since early June, night owls all over Britain have reported see delicate clouds rippling low in the north, glowing bluish-white against the dark night sky. Noctilucent clouds are made of layers of tiny ice crystals, near the Mesopause, at altitudes of around 85 kilometres. They are 10 times higher than the next-highest clouds, the familiar “mare’s tails” of cirrus clouds at the Tropopause. We can only ever see these clouds from the UK during the summer months.
There are three reasons:
Firstly, the Sun is not far below the horizon around midnight, thus its rays can illuminate these very high-altitude clouds, while it is still quite dark at the surface. It is just as we can see a high-flying plane lit up by sunshine even after sunset;
Secondly, to see these NLC events, you need to be at a latitude between 50 and 70 degrees north – that makes the British Isles an ideal observing spot;
Thirdly, these clouds only exist when the mesopause (85 – 90 km) is extremely cold – and this only occurs (paradoxically, perhaps) around the Summer Solstice!
The talk will cover visual and Lidar observations from the ground as well as measurements from rockets and satellites.
NLCs are observed from UK these days much more frequently than, say, up to the early part of last century. This is very direct evidence of global change on our atmosphere. In addition to observations, the theoretical basis of NLC will also be described – in particular related to the rather paradoxical situation that they only occur in the very coldest region of the entire atmosphere which in turn is actually in the vicinity of the SUMMER Polar Mesopause!
4th Jun 2020: CANCELLED ESAS Telescope and Imaging Fest
We’re having a repeat of our successful practical evening when members (and non-members) can bring their equipment to discuss their problems – and find solutions - with more experienced fellow members.
Don’t worry that your equipment problem is too trivial to bring up – any problem that stops you enjoying your hobby is a problem needing a solution – and we can provide it!
More expert astronomers, whom we would love to see to help other less experienced members, please come along with equipment if possible.
Even if you don’t (yet) have equipment of your own, come and see the Society’s loan equipment and discuss its loan to you to help you in your hobby.
So, equipment or not, come along and have a relaxing evening with like-minded people.
4th Jun 2020: Will Joyce : Stopping by at La Palma (and Tenerife) Observatories
|NOTE: This is an online ZOOM meeting. Access to the meeting will be emailed to members.|
Last Autumn,while Will Joyce was booked to talk on a cruise trip to the Canaries which was to visit La Palma, Will thought “why not arrange a visit to the observatory there to gather experiences to share in future outreach events and to complement the historical work done by the Royal Greenwich Observatory”. Since the multi-national telescopes on the summit of La Palma are professional operational installations, they are not normally open to the public, but that didnʼt stop Will from approaching the Isaac Newton Group Office to ask to visit. The astronomers there were extremely helpful and made all the arrangements for a smooth and informative visit to both the Isaac Newton and the William Herschel Telescopes. In this talk, Will will (!) share his experience with you, while outlining the setup and operation of these observatories, mixing in a little astronomy and a few anecdotes along the way.
Oh yes, on the neighbouring island of Tenerife there aremore telescopes, some of which are open to public tours, so Will also joined up with one of these tours and the talk he has for ESAS will include this visit too.
This talk hopefully complements the short talk about a visit to La Palma given last Autumn by Rosemary Selmes
7th May : Stephen Tonkin : Ten Ways the Universe Tries to Kill You
|NOTE: This was an online ZOOM meeting.|
From gamma-ray bursts to asteroid impacts, an overview of cataclysmic events. This light-hearted but scientifically robust approach incorporates a lot of fundamental cosmological processes, from stellar evolution to galactic interaction. It is appropriate for both beginning and intermediate amateur astronomers.
2nd Apr : CANCELLED : Melanie Davies : Living in Space
Due to health concerns, the April 2020 meeting has been cancelled.
5th Mar : Greg Smye-Rumsby: “Space, what’s it all about?”
Details to be made available soon
6th Feb John Fox : Astrophotography using a DSLR and a normal photographic mount
John is Chairman of Wealden Astronomers and is a STEM Ambassador doing astronomy outreach and the stargazing evenings at the OSC. He is also a volunteer driver on the Volk's Electric Railway in Brighton—his great, great uncle was Magnus Volk who built the railway in 1883!
John has spent over 53 years in the professional photographic arena and has practical experience in all formats of film equipment up to and including 5”x4” plate cameras.
He won “Photographer of the Year” in the 1983, 'Southern Press Radio and Television' Awards and has also won three 'Ilford' awards during his 32 years as a press photographer working both in Sussex and Manchester. Outside of his press photography adventures John has also photographed over 1,400 weddings during his long career.
John switched to digital in 2003 and has embraced the freedom of shooting and editing digital imagery. Now semi-retired, John has taken the opportunity to pursue his passion for astrophotography, panorama and 360 VR along with his love of all things video including SFX editing techniques
2nd Jan : Will Joyce :The Search for Intelligent Life in Deep Space
An extremely thought-provoking and entertaining overview of the arguments for and against the probability of other ‘intelligent’ life in the Milky Way or the wider universe.
5th Dec 2019 : Dr. Jan Drozd : A Pale Blue Dot – Earth from an Alien’s Perspective
Dr Jan Drozd is a retired biological (microbiology and biochemistry) scientist who has worked in academia, industry and government. He was once the recipient of a Royal Society European Research Fellowship. He is a member of Wadhurst Astronomy Society and is interested in many aspects of astronomy. He has written several articles for Popular Astronomy, the magazine of the Society for Popular Astronomy.
In this Decembers' meeting, Jan considers how intelligent and advanced aliens who study exoplanets, in a similar way that we do, might piece together the history of the Earth’s formation, the evolution of life and its impact on the environment on this “pale blue dot” we call home.
Many of us will be familiar with the opening mission statement from the original Star Trek TV series:
Space: the final frontier. These are the voyages of the Starship Enterprise. Its continuing mission: to explore strange new worlds, to seek out new life and new civilizations, to boldly go where no one has gone before.
We are so used to looking outwards from our planet, that it is interesting to consider how curious and dispassionate aliens, from a more scientifically advanced civilisation than ours, with a similar mission statement to the above, might piece together the history of the Earth’s formation, the evolution of life and its impact on the environment on this “pale blue dot” we call home.
7th November AGM and Members' Evening : Lester Selmes, Rosemary Selmes, Peter Bolwell, Mark Jarvis
SPACE JUNK, by Peter Bolwell Peter’s talk concerns the risks posed to space flight - both manned and unmanned - by discarded pieces of debris from previous missions which have been left in orbit, and the continuing disregard for the problem as ever more satellites are launched into space.
Then two founder members of ESAS:
MY TELESCOPE PROJECT, by Lester Selmes Lester’s talk is about a telescope installation at his home, which I believe contains some reference to road works!
ISAAC NEWTON TELESCOPE VISIT, by Rosemary Selmes Rosemary will recount a holiday trip to the Roque de los Muchachos Observatory in La Palma where the INT was moved from Herstmonceux in 1984.
Then last, but by no means least: CHASING THE ISS, by Mark Jarvis. Mark will briefly cover how to find out when and where the International Space Station will be visible and how to photograph transits of the Sun and Moon.
3rd Oct 2019 Dr Stephen Wilkins : James Webb Telescope and associated science
Talking about the technical background and history of the JWT project. About the technology and about the problems encountered that has led to the delays that we are all aware of.
Dr Stephen Wilkins also informed us about https://www.brightonwonderfest.com/ and the involvement that we could all provide.
5th Sept 2019 Ian Whiteley : The Royal Greenwich Observatory at Herstmonceux
Ian has thoroughly researched the RGO’s history, especially its time at Herstmonceux and will be using unique video interviews with RGO staff to illustrate his talk.
Astronomers who worked at the RGO in its Herstmonceux years share their memories of discovering the first stellar mass black hole, job interviews with the Astronomer Royal and earning 'a bob a night' on observation duty (video presentation).